EP1884592A1 - Method for feeding a fibrous material suspension into the headbox of a paper machine - Google Patents

Method for feeding a fibrous material suspension into the headbox of a paper machine Download PDF

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Publication number
EP1884592A1
EP1884592A1 EP07013237A EP07013237A EP1884592A1 EP 1884592 A1 EP1884592 A1 EP 1884592A1 EP 07013237 A EP07013237 A EP 07013237A EP 07013237 A EP07013237 A EP 07013237A EP 1884592 A1 EP1884592 A1 EP 1884592A1
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EP
European Patent Office
Prior art keywords
headbox
suspension
pulp suspension
paper machine
dilution
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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EP07013237A
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German (de)
French (fr)
Inventor
Erwin Binder
Johannes Ecker
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Voith Patent GmbH
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Voith Patent GmbH
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Publication of EP1884592A1 publication Critical patent/EP1884592A1/en
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/06—Regulating pulp flow
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water

Definitions

  • the invention relates to a method for feeding a pulp suspension according to the preamble of claim 1.
  • Such methods are used to feed pulp suspension paper machines.
  • the required Stoffzu brieflysysteme are basically known. The requirements of these methods are high, in particular, a constant volume flow with strictly prescribed composition should be fed smoothly to the paper machine.
  • the pulp suspension to be supplied receives most of the fibers from a thick stock suspension provided in the stock preparation plant.
  • the latter has e.g. a typical consistency between-2.5 and 5%.
  • dilution liquid e.g. White water of the paper machine
  • the consistency is lowered to a value that is favorable for the operation of the headbox of the paper machine.
  • This white water is optimally suited for this dilution task, but it can give problems because of the high gas content (mainly air). The largest amount of these gases escapes very quickly.
  • the invention is based on the object to provide methods of the type mentioned above, with which a stream is passed to the headbox and in spite of reduced volume of the guided in the system pulp suspension, a high quality of the paper produced from the pulp suspension can be achieved.
  • FIG. 1 shows a first example for carrying out the method according to the invention.
  • a pulp 16 which was produced as an aqueous suspension in the stock preparation plant (not shown), is mixed in a mixing device 15 with additives 17 which serve to improve the quality of the paper produced later.
  • Another material supplement comes from the fiber recovery 29, which is often used to clarify wastewater containing fibers, fines and fillers.
  • the recovered fiber thick stock 30 of the fiber recovery 29 is fed here into the mixing device 15.
  • the mixing device 15 opens into a mixing chest 18, from which the suspension is conveyed with a fuel pump 19 into the machine chest 20.
  • the machine chest 20 forms a supply in order to operate the paper machine 2 without interruption continuously.
  • the thick stock suspension 4 passes into a mixing device, which is advantageously a mixing tube 8, the so-called Hydromix of the Applicant is, for example, in the DE 100 05 694 A1 is described.
  • the fibrous suspension S thus formed is then produced in the usual manner by mixing the thick stock suspension 4 with a diluting liquid 5 and thereafter has substantially the consistency desired for the operation of the headbox 1 of the paper machine 2 at this point. It is known that headbox consistencies range between 0.5 and 2%, usually around 1%.
  • the relatively large volume flow of the dilution liquid 5 individual components (return streams) and the thick stock suspension 4 can be mixed in each provided ports.
  • the dilution liquid 5 originates from the first white water 12, that is, the water accumulated in the forming area of the paper machine 2 in the first white water channel 28. It is often referred to as Siebciesser I (SWI), in contrast to the later occurring on the paper machine white water 13, which contains much less fines.
  • the amount of the stock suspension 1 supplied pulp suspension S is controlled, for example by the speed of the headbox pump 9 is adjusted using a flow rate measurement 40 before the headbox 1.
  • the remainder of remaining specks and contaminants is excreted by a sorting system 6.
  • this sorting system 6 consists of one or more pressure sorters operated in parallel, such as one shown by way of example in FIG. 2.
  • the rejected on the screen 35 can be partially returned as a reject flow 7 in the mixing tube 8. Another part of the reject is discarded.
  • Gas-containing liquid 25 (suspension) removed from the top of the pressure sorter can be returned to the white water channel 28 of the paper machine 2, where the air escapes and the solid is reusable.
  • Modern headboxes 1 are often equipped with a dilution water metering 3 (so-called module jet), which makes it possible to selectively add a dilution liquid at certain points, viewed transversely to the machine direction.
  • a partial stream 22 is branched off from the dilution water treated in the degassing apparatus 11 in the system described here. This is preferably freed again from possibly remaining residual contaminant particles via a pressure sorter 23 and then fed as dilution water 27 into the dilution water metering 3 of the headbox 1.
  • the pressure sorter 23 used in the dilution water stream can also discharge both a reject stream 26 (overflow) and a gas-containing liquid 24, which for example are also introduced into the white water channel 28 of the paper machine 2.
  • the pressure sorter 23 shown schematically in FIG. 2 is of a type which is particularly well suited for carrying out the method; in particular, it can also be used for the sorting installation 6.
  • the pressure sorter is provided with a rotationally symmetrical, in particular cylindrical screen basket 35 through which the inflowing suspension can flow radially from the inside out, unless they are on the screen basket 35 is rejected.
  • the blockage of the screen basket 35 is prevented in a conventional manner by a rotating Siebmaschiner 36.
  • the top lid of such a sorter preferably operated with a vertical center line, is centrally located the outlet 33 for light materials and gases.
  • a gas-containing liquid is withdrawn at this outlet 33. In a later process, gas and liquid are separated.
  • the above-mentioned degassing apparatus 11 may preferably be constructed as shown in FIG. 3, namely with a front-side open drum-shaped rotatably driven rotor 38, inside which the liquid to be degassed, e.g. the white water 12 is introduced from the paper machine.
  • the central tube 37 serves this purpose.
  • an air core is formed in the middle of this apparatus.
  • a vacuum generating device 39 the gases 14 can be withdrawn from this air core.
  • This degasser is operated continuously, i. Means are used to continuously supply and remove the liquid. Overall, it is much less expensive than e.g. a common under vacuum standing large degassing tank (deculator).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Abstract

A method for supplying a fiber suspension (S) to the pulp inlet(s) (1) of a papermaking machine, with dilution device(s) in which suspension (of consistency the same as that in the inlet or not more than 0.3% higher) is formed by mixing thick pulp suspension ((4) with liquid diluent (5), involves pumping the suspension from a pulp feed pump (9) through a sorting plant (6) into the pulp inlet, in an amount regulated in a closed system (10).

Description

Die Erfindung betrifft ein Verfahren zur Zuführung einer Faserstoffsuspension gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a method for feeding a pulp suspension according to the preamble of claim 1.

Derartige Verfahren werden zur Versorgung von Papiermaschinen mit Faserstoffsuspension verwendet. Die dazu benötigten Stoffzuführsysteme sind grundsätzlich bekannt. Die Anforderungen an diese Verfahren sind hoch, insbesondere soll ein konstanter Volumenstrom mit streng vorgegebener Zusammensetzung störungsfrei der Papiermaschine zugeführt werden. Die zuzuführende Faserstoffsuspension erhält den größten Teil der Fasern aus einer in der Stoffaufbereitungsanlage bereit gestellten Dickstoffsuspension. Letztere weist z.B. eine typische Konsistenz zwischen-2,5-und 5 % auf. Durch Zumischen von Verdünnungsflüssigkeit, z.B. Siebwasser der Papiermaschine, wird die Konsistenz auf einen Wert abgesenkt, der für den Betrieb des Stoffauflaufes der Papiermaschine günstig ist. Dieses Siebwasser ist optimal für diese Verdünnungsaufgabe geeignet, es kann aber wegen des hohen Gasgehaltes (überwiegend Luft) Probleme geben. Der mengenmäßig größte Anteil dieser Gase entweicht sehr schnell. Die Restgase dagegen müssen oft aufwändig entfernt werden. Wenn das nicht erfolgt, wird die Qualität des hergestellten Papiers unzulässig herabgesetzt, was insbesondere für die typischerweise nach diesem Verfahren hergestellten holzfreien Papiere gilt, also Papiersorten, die bevorzugt für grafische Zwecke verwendet werden sollen.Such methods are used to feed pulp suspension paper machines. The required Stoffzuführsysteme are basically known. The requirements of these methods are high, in particular, a constant volume flow with strictly prescribed composition should be fed smoothly to the paper machine. The pulp suspension to be supplied receives most of the fibers from a thick stock suspension provided in the stock preparation plant. The latter has e.g. a typical consistency between-2.5 and 5%. By admixing dilution liquid, e.g. White water of the paper machine, the consistency is lowered to a value that is favorable for the operation of the headbox of the paper machine. This white water is optimally suited for this dilution task, but it can give problems because of the high gas content (mainly air). The largest amount of these gases escapes very quickly. The residual gases, however, often have to be removed consuming. If this is not done, the quality of the paper produced is unduly reduced, which is especially true for the wood-free papers typically produced by this method, ie paper grades which are preferably to be used for graphic purposes.

Aus der EP 0 969 142 A2 ist ein Verfahren der o.g. Art bekannt, bei dem also eine Faserstoffsuspension zu einem Stoffauflauf einer Papier- oder Kartonmaschine zugeführt wird. Dieses Verfahren ist auch für hochwertige Papiersorten geeignet, aber relativ aufwändig.From the EP 0 969 142 A2 is a method of the type mentioned above, in which therefore a pulp suspension is fed to a headbox of a paper or board machine. This method is also suitable for high quality paper grades, but relatively expensive.

Der Erfindung liegt die Aufgabe zu Grunde, Verfahren der eingangs genannten Art zu schaffen, mit dem ein Stoffstrom zum Stoffauflauf geführt wird und bei dem trotz reduzierten Volumens der im System geführten Faserstoffsuspension eine hohe Qualität des aus der Faserstoffsuspension hergestellten Papiers erreicht werden kann.The invention is based on the object to provide methods of the type mentioned above, with which a stream is passed to the headbox and in spite of reduced volume of the guided in the system pulp suspension, a high quality of the paper produced from the pulp suspension can be achieved.

Zur Lösung der Aufgabe ist ein Verfahren mit den Merkmalen des unabhängigen Anspruches 1 vorgesehen.To achieve the object, a method having the features of independent claim 1 is provided.

Das erfindungsgemäße Verfahren zeichnet sich insbesondere dadurch aus, dass nach der Stoffauflaufpumpe keine Stoffvorratsbehälter (Bütten) benötigt werden. Dadurch lassen sich folgende Vorteile erreichen:

  1. 1. Der Investitionsbedarf für die Anlage und die Betriebskosten (Energieverbrauch) werden reduziert.
  2. 2. Produktionsänderungen sind schnell und mit wenig Papiermaschinenausschuss möglich.
  3. 3. Der Ascheverlust kann minimiert werden, was die Rohstoffkosten senkt.
  4. 4. Der normale Betrieb der das Verfahren durchführenden Anlage ist stabil und leicht regelbar.
The inventive method is characterized in particular by the fact that after the headbox pump no material reservoir (handmade paper) are needed. As a result, the following advantages can be achieved:
  1. 1. The investment requirements for the plant and the operating costs (energy consumption) are reduced.
  2. 2. Production changes are fast and with little paper machine board possible.
  3. 3. Ash loss can be minimized, which lowers raw material costs.
  4. 4. The normal operation of the system performing the process is stable and easily controllable.

Besonders günstig ist das Verfahren bei Papiermaschinen anzuwenden, auf denen holzfreies Papier erzeugt werden soll, also ein Papier, das besonders hohe Qualitätsanforderungen erfüllen muss.It is particularly favorable to use the method in paper machines on which wood-free paper is to be produced, that is to say a paper which has to meet particularly high quality requirements.

Die Erfindung und ihre Vorteile werden erläutert an Hand von Zeichnungen. Dabei zeigen:

Fig. 1
das Beispiel einer vorteilhaften Ausführungsform des erfindungsgemäßen Verfahrens;
Fig. 2
einen besonders geeigneten Drucksortierer für die Sortieranlage;
Fig. 3
einen besonders geeigneten Entgasungsbehälter.
The invention and its advantages will be explained with reference to drawings. Showing:
Fig. 1
the example of an advantageous embodiment of the method according to the invention;
Fig. 2
a particularly suitable pressure sorter for the sorting system;
Fig. 3
a particularly suitable degassing tank.

Das Schema der Fig. 1 zeigt ein erstes Beispiel zur Durchführung des erfindungsgemäßen Verfahrens. Ein Faserstoff 16, der als wässrige Suspension in der - nicht gezeigten - Stoffaufbereitungsanlage erzeugt wurde, wird in einer Mischvorrichtung 15 mit Zuschlagstoffen 17 vermischt, die zur Qualitätsverbesserung des später hergestellten Papiers dienen. Eine weitere stoffliche Ergänzung stammt aus der Faserrückgewinnung 29, die oft eingesetzt wird, um Faser-, Fein- und Füllstoff haltige Abwässer zu klären. Der zurück gewonnene Faser-Dickstoff 30 der Faserrückgewinnung 29 wird hier in die Mischvorrichtung 15 eingespeist.The diagram of FIG. 1 shows a first example for carrying out the method according to the invention. A pulp 16, which was produced as an aqueous suspension in the stock preparation plant (not shown), is mixed in a mixing device 15 with additives 17 which serve to improve the quality of the paper produced later. Another material supplement comes from the fiber recovery 29, which is often used to clarify wastewater containing fibers, fines and fillers. The recovered fiber thick stock 30 of the fiber recovery 29 is fed here into the mixing device 15.

Die Mischvorrichtung 15 mündet in eine Mischbütte 18 ein, aus der die Suspension mit einer Stoffpumpe 19 in die Maschinenbütte 20 gefördert wird. Die Maschinenbütte 20 bildet einen Vorrat, um die Papiermaschine 2 störungsfrei kontinuierlich betreiben zu können. Über eine weitere Pumpe 21 gelangt die Dickstoffsuspension 4 in eine Mischvorrichtung, bei der es sich mit Vorteil um ein Mischrohr 8, den sogenannten Hydromix des Anmelders, handelt, der z.B. in der DE 100 05 694 A1 beschrieben ist. Die so gebildete Faserstoffsuspension S wird dann in der üblichen Weise durch Vermischung der Dickstoffsuspension 4 mit einer Verdünnungsflüssigkeit 5 erzeugt und hat danach im Wesentlichen die für den Betrieb des Stoffauflaufes 1 der Papiermaschine 2 an dieser Stelle gewünschte Konsistenz. Bekanntlich liegen Stoffauflauf-Konsistenzen im Bereich zwischen 0,5 und 2 %, in der Regel um 1 %. In dem Mischrohr 8 können dem relativ großen Volumenstrom der Verdünnungsflüssigkeit 5 einzelne Komponenten (Rücklaufströme) und die Dickstoffsuspension 4 in jeweils dafür vorgesehenen Anschlüssen zugemischt werden. Die Verdünnungsflüssigkeit 5 stammt bei dem gezeigten Beispiel aus dem ersten Siebwasser 12, also dem im Formierbereich der Papiermaschine 2 in der ersten Siebwasserrinne 28 angefallenen Wasser. Es wird oft als Siebwässer I (SWI) bezeichnet im Unterschied zum später auf der Papiermaschine anfallenden Siebwasser 13, das sehr viel weniger Feinstoffe enthält.The mixing device 15 opens into a mixing chest 18, from which the suspension is conveyed with a fuel pump 19 into the machine chest 20. The machine chest 20 forms a supply in order to operate the paper machine 2 without interruption continuously. Via another pump 21, the thick stock suspension 4 passes into a mixing device, which is advantageously a mixing tube 8, the so-called Hydromix of the Applicant is, for example, in the DE 100 05 694 A1 is described. The fibrous suspension S thus formed is then produced in the usual manner by mixing the thick stock suspension 4 with a diluting liquid 5 and thereafter has substantially the consistency desired for the operation of the headbox 1 of the paper machine 2 at this point. It is known that headbox consistencies range between 0.5 and 2%, usually around 1%. In the mixing tube 8, the relatively large volume flow of the dilution liquid 5 individual components (return streams) and the thick stock suspension 4 can be mixed in each provided ports. In the example shown, the dilution liquid 5 originates from the first white water 12, that is, the water accumulated in the forming area of the paper machine 2 in the first white water channel 28. It is often referred to as Siebwässer I (SWI), in contrast to the later occurring on the paper machine white water 13, which contains much less fines.

Es ist die Regel, dass solches Siebwasser u.a. mit einem beträchtlichen Anteil von Luft und eventuell sonstigen Gasen vermischt ist. Das Siebwasser wird unterhalb des Papiermaschinen-Siebes aufgefangen und seitlich abgeleitet. In den dazu benutzten offenen Rinnen kann bereits ein großer Teil der enthaltenen Luft austreten. Dennoch ist es oft sinnvoll, einen weiteren Gasanteil 14 auszuscheiden, z.B. in einem speziellen Entgasungsapparat 11, wie er aus der DE 10 2004 05 1327 bekannt ist. Zur Unterstützung kann der Entgasungsapparat 11 unter einem mäßigen Unterdruck stehen. Nach dem Vermischen von Dickstoffsuspension 4 und Verdünnungsflüssigkeit 5 wird die Suspension über eine Stoffauflaufpumpe 9 hier in einem geschlossenen System 10 (also ohne offene Behälter oder Bütten) bis zum Stoffauflauf 1 geführt. Vorzugsweise wird die Menge der dem Stoffauflauf 1 zugeführten Faserstoffsuspension S geregelt, z.B. indem die Drehzahl der Stoffauflaufpumpe 9 eingestellt wird unter Verwendung einer Durchflussmengenmessung 40 vor dem Stoffauflauf 1. Der Rest an noch vorhandenen Stippen und Störstoffen wird durch eine Sortieranlage 6 ausgeschieden. Vorzugsweise besteht diese Sortieranlage 6 aus einem oder mehreren parallel betriebenen Drucksortierern, wie einer z.B. exemplarisch in der Fig. 2 gezeigt wird. Das am Sieb 35 Abgewiesene kann teilweise als Rejektstrom 7 in das Mischrohr 8 zurückgeleitet werden. Ein anderer Teil des Rejektes wird verworfen. Am Deckel des Drucksortierers abgeführte gashaltige Flüssigkeit 25 (Suspension) kann in die Siebwasserrinne 28 der Papiermaschine 2 zurückgeführt werden, wo die Luft entweicht und der Feststoff wieder verwendbar wird.It is the rule that such white water is inter alia mixed with a considerable amount of air and possibly other gases. The white water is below the Paper machine screens collected and laterally derived. In the open channels used for this purpose, a large part of the air contained can already escape. Nevertheless, it often makes sense to eliminate a further gas fraction 14, for example in a special degassing apparatus 11, as it is known from US Pat DE 10 2004 05 1327 is known. To assist the degassing apparatus 11 may be under a moderate negative pressure. After mixing thick matter suspension 4 and diluting liquid 5, the suspension is passed via a headbox pump 9 here in a closed system 10 (ie without open containers or laid paper) to the headbox 1. Preferably, the amount of the stock suspension 1 supplied pulp suspension S is controlled, for example by the speed of the headbox pump 9 is adjusted using a flow rate measurement 40 before the headbox 1. The remainder of remaining specks and contaminants is excreted by a sorting system 6. Preferably, this sorting system 6 consists of one or more pressure sorters operated in parallel, such as one shown by way of example in FIG. 2. The rejected on the screen 35 can be partially returned as a reject flow 7 in the mixing tube 8. Another part of the reject is discarded. Gas-containing liquid 25 (suspension) removed from the top of the pressure sorter can be returned to the white water channel 28 of the paper machine 2, where the air escapes and the solid is reusable.

Moderne Stoffaufläufe 1 sind oft mit einer Verdünnungswasserdosierung 3 ausgestattet (sogenannter Modul-Jet), die es gestattet, gezielt an bestimmten Stellen, quer zur Laufrichtung der Maschine betrachtet, eine Verdünnungsflüssigkeit zuzugeben. Zu diesem Zweck wird bei dem hier beschriebenen System aus dem im Entgasungsapparat 11 behandelten Verdünnungswasser ein Teilstrom 22 abgezweigt. Dieser wird vorzugsweise über einen Drucksortierer 23 noch einmal von möglicherweise noch vorhandenen restlichen Störstoffteilchen befreit und dann als Verdünnungswasser 27 in die VerdünnungswasserDosierung 3 des Stoffauflaufes 1 geführt. Ähnlich wie bei der Sortieranlage 6 beschrieben, kann auch der im Verdünnungswasserstrom eingesetzte Drucksortierer 23 sowohl einen Rejektstrom 26 (Überlauf) als auch eine gashaltige Flüssigkeit 24 abführen, die z.B. beide ebenfalls in die Siebwasserrinne 28 der Papiermaschine 2 eingeleitet werden.Modern headboxes 1 are often equipped with a dilution water metering 3 (so-called module jet), which makes it possible to selectively add a dilution liquid at certain points, viewed transversely to the machine direction. For this purpose, a partial stream 22 is branched off from the dilution water treated in the degassing apparatus 11 in the system described here. This is preferably freed again from possibly remaining residual contaminant particles via a pressure sorter 23 and then fed as dilution water 27 into the dilution water metering 3 of the headbox 1. Similar to the sorting system 6, the pressure sorter 23 used in the dilution water stream can also discharge both a reject stream 26 (overflow) and a gas-containing liquid 24, which for example are also introduced into the white water channel 28 of the paper machine 2.

Der in Fig. 2 schematisch gezeigte Drucksortierer 23 ist der Bauart nach besonders gut für die Durchführung des Verfahrens geeignet, er kann insbesondere auch für die Sortieranlage 6 verwendet werden. Man erkennt einen Einlauf 31 und einen Auslauf 32 für den Gutstoff des Sortierers sowie einen Rejektauslass 34. Der Drucksortierer ist mit einem rotationssymmetrischen, insbesondere zylindrischen Siebkorb 35 versehen, durch den die zugeflossene Suspension radial von innen nach außen strömen kann, sofern sie nicht am Siebkorb 35 abgewiesen wird. Die Verstopfung des Siebkorbs 35 wird in an sich bekannter Weise durch einen rotierenden Siebräumer 36 verhindert. Am oben liegenden Deckel eines solchen Sortierers, vorzugsweise mit vertikaler Mittellinie betrieben, befindet sich zentral der Auslass 33 für Leichtstoffe und Gase. Bei Betrieb des Drucksortierers 23 wird an diesem Auslass 33 eine gashaltige Flüssigkeit abgezogen. In einem späteren Vorgang werden Gas und Flüssigkeit getrennt.The pressure sorter 23 shown schematically in FIG. 2 is of a type which is particularly well suited for carrying out the method; in particular, it can also be used for the sorting installation 6. One recognizes an inlet 31 and an outlet 32 for the accepts of the sorter and a Rejektauslass 34. The pressure sorter is provided with a rotationally symmetrical, in particular cylindrical screen basket 35 through which the inflowing suspension can flow radially from the inside out, unless they are on the screen basket 35 is rejected. The blockage of the screen basket 35 is prevented in a conventional manner by a rotating Siebräumer 36. The top lid of such a sorter, preferably operated with a vertical center line, is centrally located the outlet 33 for light materials and gases. During operation of the pressure sorter 23, a gas-containing liquid is withdrawn at this outlet 33. In a later process, gas and liquid are separated.

Der bereits erwähnte Entgasungsapparat 11 kann vorzugsweise so aufgebaut sein, wie es die Fig. 3 zeigt, nämlich mit einem stirnseitig offenen trommelförmigen rotierend angetriebenen Rotor 38, in dessen Inneres die zu entgasende Flüssigkeit, z.B. das Siebwasser 12 aus der Papiermaschine eingeführt wird. Dazu dient das Zentralrohr 37. Infolge der Rotation der eingeführten Flüssigkeit bildet sich in der Mitte dieser Apparatur ein Luftkern. Durch eine Unterdruck erzeugende Vorrichtung 39 können die Gase 14 aus diesem Luftkern abgezogen werden. Dieser Entgasungsapparat wird kontinuierlich betrieben, d.h. es werden Mittel eingesetzt, um die Flüssigkeit kontinuierlich zu- und wieder abzuführen. Insgesamt ist er weit weniger aufwändig als z.B. ein üblicher unter Vakuum stehender großer Entgasungsbehälter (Deculator).The above-mentioned degassing apparatus 11 may preferably be constructed as shown in FIG. 3, namely with a front-side open drum-shaped rotatably driven rotor 38, inside which the liquid to be degassed, e.g. the white water 12 is introduced from the paper machine. The central tube 37 serves this purpose. As a result of the rotation of the introduced liquid, an air core is formed in the middle of this apparatus. By a vacuum generating device 39, the gases 14 can be withdrawn from this air core. This degasser is operated continuously, i. Means are used to continuously supply and remove the liquid. Overall, it is much less expensive than e.g. a common under vacuum standing large degassing tank (deculator).

Claims (13)

Verfahren zur Zuführung einer Faserstoffsuspension zu mindestens einem Stoffauflauf (1) einer Papiermaschine (2) mit mindestens einer Verdünnungseinrichtung, in der die Faserstoffsuspension (S) durch Vermischen einer Dickstoffsuspension (4) mit einer Verdünnungsflüssigkeit (5), insbesondere Wasser, erzeugt wird, deren Konsistenz gleich der im Stoffauflauf (1) oder maximal 0,3 % höher ist,
dadurch gekennzeichnet,
dass die Faserstoffsuspension (S) von einer Stoffauflaufpumpe (9) an in einem geschlossenen System (10) mengengeregelt durch eine Sortieranlage (6) in den Stoffauflauf (1) gepumpt wird.Method for feeding a pulp suspension to at least one headbox (1) of a paper machine (2) with at least one dilution device in which the pulp suspension (S) is produced by mixing a thick stock suspension (4) with a diluting liquid (5), in particular water Consistency equal to that in the headbox (1) or at most 0.3% higher,
characterized,
that the pulp suspension (S) from a headbox pump (9) in a closed system (10) volume controlled by a sorting system (6) in the headbox (1) is pumped. Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
dass zur Mengenregelung der dem Stoffauflauf (1) zugeführten Faserstoffsuspension (S) die Drehzahl der Stoffauflaufpumpe (9) eingestellt wird.Method according to claim 1,
characterized,
in that the speed of the headbox pump (9) is adjusted for the volume control of the stock suspension (1) supplied pulp suspension (S). Verfahren nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
dass der dem Stoffauflauf (1) zugeführten Faserstoffsuspension (S) im Stoffauflauf (1) mittels einer Verdünnungswasserdosierung (3) an mehreren quer zur Laufrichtung der Papiermaschine (2) verteilten Stellen Verdünnungswasser (27) zudosiert wird, um dadurch das Querprofil der gebildeten Bahn zu beeinflussen.Method according to claim 1 or 2,
characterized,
that the pulp suspension (S) fed to the headbox (1) in the headbox (1) is metered with dilution water (27) by means of a dilution water metering (3) at several points distributed transversely to the direction of travel of the paper machine (2), thereby increasing the transverse profile of the web formed influence. Verfahren nach Anspruch 1, 2 oder 3,
dadurch gekennzeichnet,
dass die Vermischung der Dickstoffsuspension (4) mit der Verdünnungsflüssigkeit (5) in einem Mischrohr (8) durchgeführt wird, dessen Auslassöffnung mit der Stoffauflaufpumpe (9) verbunden ist.Method according to claim 1, 2 or 3,
characterized,
in that the mixing of the thick matter suspension (4) with the diluting liquid (5) is carried out in a mixing tube (8) whose outlet opening is connected to the headbox pump (9). Verfahren nach Anspruch 1, 2, 3 oder 4,
dadurch gekennzeichnet,
dass der Rejekt (7) der Sortieranlage (6) teilweise direkt oder indirekt in die Faserstoffsuspension (S) zurückgeführt wird.Method according to claim 1, 2, 3 or 4,
characterized,
that the reject (7) of the sorting system (6) is partly returned directly or indirectly to the pulp suspension (S). Verfahren nach Anspruch 5,
dadurch gekennzeichnet,
dass der Rejekt (7) teilweise in das Mischrohr (8) geführt wird.Method according to claim 5,
characterized,
that the reject (7) is partially guided into the mixing tube (8). Verfahren nach einem der voran stehenden Ansprüche,
dadurch gekennzeichnet,
dass die Sortieranlage (6) mindestens einen Drucksortierer umfasst und einstufig ist.Method according to one of the preceding claims,
characterized,
that the sorting system (6) comprises at least one pressure screen, and is single stage. Verfahren nach Anspruch 7,
dadurch gekennzeichnet,
dass die Sortieranlage (6) nur einen einzigen Drucksortierer umfasst.Method according to claim 7,
characterized,
that the sorting system (6) only comprises a single pressure screen. Verfahren nach einem der voran stehenden Ansprüche,
dadurch gekennzeichnet,
dass die Verdünnungsflüssigkeit (5) dem Siebwasser der Papiermaschine (2) entnommen wird.Method according to one of the preceding claims,
characterized,
that the dilution liquid (5) is removed from the white water of the paper machine (2). Verfahren nach Anspruch 9,
dadurch gekennzeichnet,
dass das Siebwasser vor dem Verdünnen vorzugsweise mit einem Entgasungsapparat (11), der einen Rotor zur Erzeugung eines Zentrifugalfeldes enthält, entgast wird.Method according to claim 9,
characterized,
that the white water is preferably degassed before dilution with a degassing apparatus (11) containing a rotor for generating a centrifugal field. Verfahren nach einem der voran stehenden Ansprüche,
dadurch gekennzeichnet,
dass in dem geschlossenen System (10) keine weiteren Trennaggregate zur Feststoffabscheidung verwendet werden.Method according to one of the preceding claims,
characterized,
that in the closed system (10) no further separation units for Solid separation can be used. Verfahren nach einem der voran stehenden Ansprüche,
dadurch gekennzeichnet,
dass in dem geschlossenen System keine Aggregate zur Entlüftung verwendet werden.Method according to one of the preceding claims,
characterized,
that in the closed system no units are used for venting. Verfahren nach einem der voran stehenden Ansprüche,
dadurch gekennzeichnet,
dass die Faserstoffsuspension so hergestellt und aufbereitet wird, dass sie zur Erzeugung von holzfreiem Papier verwendet werden kann.Method according to one of the preceding claims,
characterized,
that the pulp suspension is prepared and processed so that it can be used to produce wood-free paper.
EP07013237A 2006-08-02 2007-07-06 Method for feeding a fibrous material suspension into the headbox of a paper machine Withdrawn EP1884592A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200610036018 DE102006036018B3 (en) 2006-08-02 2006-08-02 Supplying fiber suspension, formed by diluting thick suspension, to pulp inlet of papermaking machine, by pumping suspension from pulp feed pump through sorting plant

Publications (1)

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EP1884592A1 true EP1884592A1 (en) 2008-02-06

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US10995454B2 (en) * 2013-12-19 2021-05-04 3M Innovative Properties Company Using recycled waste water to make nonwoven fibrous materials suitable for use in a pollution control device or in a firestop
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DE202009018662U1 (en) * 2009-05-12 2012-07-16 Voith Patent Gmbh constant part
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CN102282313A (en) * 2008-12-12 2011-12-14 沃依特专利有限责任公司 Screening in an approach flow system
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CN114108353A (en) * 2021-12-10 2022-03-01 安德里茨（中国）有限公司 Screening system
CN114108353B (en) * 2021-12-10 2024-03-01 安德里茨（中国）有限公司 Screening system
CN115787336A (en) * 2022-12-09 2023-03-14 安德里茨（中国）有限公司 A mix thick liquid groove device and make paper and be equipped with thick liquid line for making paper be equipped with thick liquid line
CN115787336B (en) * 2022-12-09 2024-01-19 安德里茨（中国）有限公司 Pulp mixing tank device for papermaking pulp preparing line and papermaking pulp preparing line

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